Hello citizens of the Super User Ville!
As our website is all about these beloved personal computers, it appears to me that pc can be applied to almost any question. As so, I don't think that it is useful to have this tag at all; it simply doesn't add any meaning to a question and isn't useful for searching purposes. I also don't think ye can ask a question that is only about pc as there would always be a more specific tag available for your question.
Oh, can ye help call the mighty Trogdor to burn this tag?
Trogdor, can thou help us?